IM/backend/IM_API/Models/Conversation.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;

namespace IM_API.Models;

public partial class Conversation
{
    public int Id { get; set; }

    /// <summary>
    /// 用户
    /// </summary>
    public int UserId { get; set; }

    /// <summary>
    /// 对方ID（群聊为群聊ID，单聊为单聊ID）	
    /// </summary>
    public int TargetId { get; set; }

    /// <summary>
    /// 最后一条未读消息ID	
    /// </summary>
    public long? LastReadSequenceId { get; set; }

    /// <summary>
    /// 未读消息数	
    /// </summary>
    public int UnreadCount { get; set; }

    public ChatType ChatType { get; set; }

    /// <summary>
    /// 消息推送唯一标识符
    /// </summary>
    public string StreamKey { get; set; } = null!;

    /// <summary>
    /// 最后一条最新消息
    /// </summary>
    public string LastMessage { get; set; } = null!;

    /// <summary>
    /// 最后一条消息发送时间
    /// </summary>
    [Column(TypeName = "datetimeoffset")]
    public DateTimeOffset LastMessageTime { get; set; }


    public virtual User User { get; set; } = null!;
}